Samsung Air Conditioner Error Code P433

P433 indicates that a refrigerant charging operation was attempted or detected while the outdoor temperature exceeded 15 degrees Celsius and the system was in heating mode. This is a condition alert rather than a component failure code. It signals that the refrigerant charging procedure cannot be completed accurately under these conditions. A technician needs to adjust the operating mode or wait for appropriate outdoor temperatures before proceeding.

P433 itself is a protective alert designed to prevent improper refrigerant charging, so the system is functioning as intended by flagging this condition. However, if refrigerant charging was actually attempted under these conditions, the resulting incorrect refrigerant level could stress the compressor and reduce system reliability over time. Have a qualified technician verify the refrigerant charge is correct before continuing normal operation.

If P433 was triggered only because of incorrect service conditions and no refrigerant work is needed, the diagnostic and correction cost is typically minimal, often in the range of $75 to $150 for a technician visit. If the outdoor temperature sensor is faulty and requires replacement, parts and labor costs could range from $150 to $350 depending on the model and local labor rates. If refrigerant was improperly charged, additional costs for recovering and recharging refrigerant may apply.

This code is specifically related to refrigerant charging procedures, which require EPA certification and specialized equipment to perform legally and safely. Homeowners should not attempt to resolve this code themselves. Contact a certified HVAC technician who can assess the system conditions and perform the charging procedure correctly.

A power reset may clear the code temporarily, but if the underlying condition that triggered it, such as an incorrect charging procedure or a faulty outdoor temperature sensor, is not resolved, the code may return. Simply resetting the unit does not confirm the refrigerant charge is correct or that the system is ready for normal operation.